Tehran University of Medical Sciences Iranian Journal of Psychiatry 1735-4587 10 3 2016 02 06 212 213 EN Mahin Eslami Shahre Babaki Neurology Research Center AND Department of Psychiatry, Afzalipour School of Medicine, Shahid Beheshti Hospital, Kerman University of Medical Sciences, Kerman, Iran Fariborz Estilaee Department of Psychiatry, Neyshabur University of Medical Sciences, Neyshabur, Iran 2015 10 13 Dandy-Walker syndrome is a congenital brain malformation involving the cerebellum and the fourth ventricle. The key features of this syndrome are mental retardation, cerebellar ataxia, and symptoms related to hydrocephaly. The psychiatric aspects of this syndrome have been insufficiently appreciated. Described here is a 17- year- old girl with an acute manic episode emerged in the course of Dandy-Walker syndrome. Presentation and treatment are then addressed. https://ijps.tums.ac.ir/index.php/ijps/article/view/14 https://ijps.tums.ac.ir/index.php/ijps/article/download/14/10